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33921-75HH / E6T18195H1 Mazda Spiano Engine Control Unit ECU.
Product Description
The Engine Control Unit (ECU) with part numbers 33921-75HH and E6T18195H1 is an OEM module designed for the Mazda Spiano (HF21S). This ECU regulates vital engine systems such as fuel injection, ignition timing, air/fuel mixture, idle speed control, emission functions, and on-board diagnostics.
Units are typically sourced as used or tested OEM originals. Prior to installation, it’s essential to verify pin configuration, software version, and compatibility with the vehicle’s immobilizer or key coding. Reprogramming or cloning may be required to fully match the ECU to your vehicle.
Compatibility Table
Vehicle Make | Model / Chassis | Engine | Year Range* | ECU Part Number | Notes |
---|---|---|---|---|---|
Mazda | Spiano (HF21S) | 0.66 L / 1.0 L (kei class engine) | approx. mid-2000s onward | 33921-75HH | Commonly listed in parts catalogs and used ECU listings (e.g. BeForward) |
Mazda | Spiano | — | — | E6T18195H1 | Alternative ECU designation used on some units |
* Year ranges are approximate. Always verify with your vehicle’s original ECU and VIN details.
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